Fix some unittests for 64-bit asm. They were operating on int variables as if they were longs. This was causing asm1_1 to fail when compiled with -O3 because it was overwriting the spilled value of callee-saved register %rbx, which the runtime was using as a pointer value at the time.

module moduleinfo2;

extern(C) int printf(char*, ...);

void main()
{
    printf("listing modules:\n");
    foreach(m; ModuleInfo)
    {
        printf("  %.*s\n", m.name.length, m.name.ptr);
    }
}